The geology of the Slaughteryard Creek area, Mt. Isa, Queensland

Doust, Geoffrey (1976). The geology of the Slaughteryard Creek area, Mt. Isa, Queensland Honours Thesis, School of Physical Sciences, The University of Queensland.

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Author Doust, Geoffrey
Thesis Title The geology of the Slaughteryard Creek area, Mt. Isa, Queensland
School, Centre or Institute School of Physical Sciences
Institution The University of Queensland
Publication date 1976
Thesis type Honours Thesis
Supervisor Dr. L.R. Davidson
Total pages 941
Language eng
Subjects 0403 Geology
Formatted abstract

An apophysis of the Sybella Granite intrudes strata of the Eastern Creek Volcanics in the vicinity of Slaughteryard Creek, 8 miles west-north-west of Mt. Isa. This has resulted in the impression of higher temperature metamorphic conditions on rocks of a tectonic block which is separated from the regional Amphibolite facies schists by a large shear zone.

This tectonic block originated as a drag fold in the eastern overturned limb of the regional anticline structure. Detachment of this fold from the adjacent strata was accompanied by the emplacement of an en echelon series of granitic sills within the shear. Diapiric upwelling of the main Sybella Granite in the core of the regional structure caused truncation of its limbs by the Mt. Isa and May Downs faults respectively. This movement also induced the emplacement of the main sill-like apophysis. Introduction of a large gneiss mass along the décollement pushed the intruded tectonic block northwards, reversing the folded attitude of some strata by frictional drag. This movement also disrupted strata in the adjacent regional schists producing permeable zones which gave access to later metasomatic fluids. A regional greenschist facies metamorphism was impressed during unloading and uplift.
Keyword Geology
Mount Isa Fault
May Downs Fault

Document type: Thesis
Collection: UQ Theses (non-RHD) - UQ staff and students only
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Created: Fri, 20 Mar 2015, 12:40:53 EST by Lucy Russell on behalf of Scholarly Communication and Digitisation Service